<p>The purpose of the research is to find out the synthesis, formula and characteristic of complex of Nickel(II) with hydantoin (hyd). Complex of nickel(II) with hydantoin have been synthesized in 1 : 1 mole ratio of metal to ligan in methanol.The formula of complex which are predicted from analysis of % Ni in complex by Atomic Absorption Spectroscopy (AAS) is Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>.SO<sub>4</sub>. Ratio of cation and anion of complex is measured by conductivitymeter correspond to 1: 1. The thermal analysis is determined by Differential Thermal Analyser (DTA) indicate that complex contain some hydrate, thus possibility formula of complex is [Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]SO<sub>4</sub>.H<sub>2</sub>O (Diaquadihydantoinnikel(II) sulfat monohidrat). Data of infra red spectra show a shift of N-H group and tertier N group 138 absorption and indicate this functional group coordinated to the center ion. Magnetic Suscepbility measurement show that the complex is paramagnetic with μ<sub>eff</sub> = 3.2 BM. The UV-Vis spectra appear do to 2 transition peak on λ = 740 nm (13,513 cm<sup>-1</sup>) and 405 nm (24,691 cm<sup>-1</sup>). The peak indicate that structure of complex is octahedral with transition <sup>3</sup>A<sub>2g</sub>→ <sup>3</sup>T<sub>1g</sub>(P)(ν<sub>2</sub>) andtransition <sup>3</sup>A<sub>2g</sub> → <sup>3</sup>T<sub>1g</sub>(F)(ν<sub>3</sub>). One peak which is not appear is transition <sup>3</sup>A<sub>2g</sub> → <sup>3</sup>T<sub>2g</sub> (F)(ν<sub>1</sub>) which also estimate of 10 Dq (Δ<sub>0</sub>) is 103.615 kJ mol<sup>-1</sup>.</p>
SYNTHESIS AND CHARACTERIZATION OF COMPLEX DIAQUADIHYDANTOIN NICKEL(II) SULFAT MONOHIDRAT)
